Shockproof starter for direct-current motors



E. NlSHl Aug. 26, 1930.

SHOCKPROOF STARTER FOR DIRECT CURRENT MOTORS Filed June "7, 1929Patented Aug. 26, 1930 UNITED STATES PATENT o -FICE EISUKE NISHI, OFSUKEGAWA-CHO, JAPAN, ASSIGNOR TO KABUSHIKI-KAISHA HITACHI-SEISAKUSHO, OFTOKYO, JAPAN, A CORPORATION OF JAPAN SHOCKPBOOF STARTER FORDIRECT-CURRENT MOTORS Application filed June 7, 1929, Serial No.369,171, and in Japan June 20, 1958.

' view, the starters heretofore employed do not operate satisfactorily,especially when they are exposed to severe shocks and vibrations,such'as are met-with on inen-of-war. In such a case. the elcctromagnetof a starter is liable to release the controlling arm at the shocks andvibrations resulting from the discharge of a fire-arm, leading to theunwarranted stoppage of the motor. i

The present invention aims to obviate the above-mentioned drawbacks.According to the invention, the controlling arm is ositively locked andheld at its operative position by means of a hook fixed to thecontrolling arm and engaging with a finger or stopper jointed to arotatable spindlewhich is mounted upon the panel of the starter. Thestopper or finger is turnable in .a vertical plane around a horizontalpin mounted on the spindle. The said spindle, being connected with anarmature of anielectromagnet forming the low voltage release, willsupport the stopper at a certain position to firmly take hold of thecontrolling arm. as long, as the electromagnet is energized. while, whenthe electroinagnet is tie-energized, the spindle will be allowed torotate on its own axis, and conjointly there with the stopper rotatesand its sense of yieldability will be brought to coincide with thedirection of motion of the hook attached to the controlling arm, therebythe latter will be released, under the action of a return spring, toresume the position of full resistance.

For a better understanding ofmyinvention, reference may now be had tothe accompanyin; drawings forming a part of this specification, in whichlike characters of reference designate like parts throughout the severalnews.

Figure l is a plan view of a starter according to the invention;

Figure 2 is a fragmentary plan view, on an enlarged scale, showing thecontrolling arm as held at the operative position by the stopperassociated with the low voltage release;

Figure 3 is an end elevation view of the parts shown in Figure 2;

Figure 4 is a fragmentary elevational view 55 showing entire lockingdevice at its operative position.

Figure 5 is a plan view of a modified form of a starter according to theinvention;

Figure 6 is a fragmentary cross-sectional 7 view, the section beingtaken substantially on line VI-VI of Figure 5.

In the drawings, A is the controlling arm pivotally mounted at one ofits ends on a stationary axis 1 and provided at the other with -a bookQ. Mounted on the back side of the controlling arm is a contact bridge3. 4 is the handle for manipulating the arm. 7 are contact pieces sodisposed as to lie along the periphery of a circle drawn the stationaryaxis 0 1 as centre and connected to successive taps attached to thestarting resistance. 0 is a conductive plate connected to one terminalof the main circuit. The contact bridge 3 makes a sliding contact withthe plate 0 to 35 electrically connect the plate with one or adjoiningtwo of the contact pieces 7. The above mentioned construction does notmaterially differ from the corresponding parts of any ordinary starter.a.

worked by i iii .w iig tile, iiiiimtiii'e 1U, logo e," with the i5spindle 11ml (lie Stopper 8, away i'i-oiii llio pole M pieces P of ill:olelrtioiiiiigriict ."uliiiioiit Lilo mummii to Elie spindle 5.pi'efci'zilil y uni'lei'nealli theiv engaged v of. is ill auxiliarylillllllle Ll provided will. :1 i0 coiiiiulli Hi i11 "I'fll;.' spiralspring 1Z1. Tliispring 13 iixvd 211' iwiz" 9Q one of its ends on thelie-Living 1 the other Ollll on :i liciit 1111111 1 1 311 the Spindle1%, tho free wi l oi llio i in turn nears T iiisi the (l""iil'l' l11afending )ortion of lllL on pim US. v

2; action 01% the spring 13 is to lir'ii ll: 6

in the opposite (lll'P tion to iliiil of l r and lllC imzi spring" 12.The spring 2 lilflllClijllQlflQYiT- i i ages of lifiion are soproportioned l'llilt norspring mall The action of the latter one ifoval-liaiaiicoi: filial: f (110 Fm-moi lLfVLllK l ill! izmi :ii'iiiiiiumi0 is wlY'Ill lo wnlau i lllii' poll; pit-130s l oi the 011 32' tail pinf assuming" the panel bmiiil. iii.

mi s. i is :1 p ziiu ilX-Bl A? ling arm A.

HIOVWl l I'C-Ill lil sis'tiiiico in ll:

PIL lI Dltllt \(ll arm 15 iii'tiirlioll lo lie zi ix and will displuoe wii iil iii ongzig'imi" Wiili fl LllQ iioii :i

no to lilll 111 in 2i Loin-ion spi" in no. 5 SUlJFl'Zlllilill wiiiiiiwlii y i' lli ll l'lio iioiiyjlii lf ioiiglil to i the controlling 2 miwill be p at 'liQ operati e position.

llhen the e ctiio motor. for which V mom-(ling to 10 equipped with. 151ie=1ir '13.

{l5 controlling arm A i.

tion, the stopper is initially held in such a manner that the sense ofyieldability is pen pendicular to the travel of the book. The hook,therefore, is firmly held in its opera tive position, being in positiveengagement with the stopper, to be released only by the rotation of theplane of yieldability consequent to the rotation of the main spindle ascaused by the releasing of iron armature by the electroinagnet.yieldability of the stopper remains perpendicular to the travel of thehook attached to the controlling arm as long as the electro magnet isenergized, there is no possibility that the controlling arm is released.by shocks and vibrations during the operation of themotor.

It has been stated in the above that the plane of yieldability rotatesby a right angle when the armature is released by the electromagnet.However. this angle may be an angle greater or less than the rightangle.

In the modification shown in Figures 5 and 6, the auxiliary spindle H isdispensed with and the auxiliary spring 13, which counteracts andoverbalances the action of the main spring 12, is mounted on the samespindle 5 as the main spring. In this construction, a disc-like piece 18formedwith a projecting nose 19 is rotatably mounted on the spindle 5and is connected to one end of the spring 13. The disc 18 is furtherprovided with a projection 20 extending parallel to the spindle andadapted to act on the extended por tion a of the armature 10 when thedisc is not acted upon by the push plate 16 of the con trolling arm. Theother parts of the construction and the function of the device aresimilar to those of the device shown in Figures 1 to 4.

It will be apparent to those skilled in the art that the invention isnot limited to the modifications which have been actually illustrated,but, on the contrary, various minor changes and modifications may bemade without departing from the spirit of my invention or from the scopeof the appended claims.

Vhat I claim is 1. Shock proof starter. comprising a controlling arm, ahook fixed to the said controlling arm, a rotatable spindle, anelectromagnetic means adapted to act on the said spindle, a stopperjointed to the said spindle in such a manner that it is yieldable in onesense only and adapted to come into a positive engagement with the saidhook as long as the said electromagnetic means is energized, the saidstopper releasing the said hook freely when the said spindle rotatesowing to the releasing action of the said electro-magnctic means.

2. Shock proof starter, comprising a controlling arm. an electromagnet,a hook fixed to the said controlling arm, a spindle, an iron pieceassociated with the said spindle Since "the plane of and co-operatingwith the-said electromagnet, and a stopper provided on the said spindleto come into a positive engagement with the said hook as long as thesaid iron piece is attracted by the electromagnet, the said stopperreleasing the said hook freely when the said spindle rotates owing tothe release of the iron piece by the electromagnet.

3. Shock proof starter, comprising acontrolling arm, an electromagnet, ahook fixed to the said controlling'arm, a spindle, an iron piecefixed tothe said spindle and cooperating with the said electromagnet, and astopper adapted to be engaged with the said hook and jointed to the saidspindle in such a manner that normally it maintains a substantiallyupright position and is turnable in one sense only.

4. Shock proof starter, comprising a controlling arm, an electromagnet,a hook fixed to the said controlling arm, a spindle adjacent to the saidelectromagnet, an iron piece mounted on the said spindle andco-operating with. the said electromagnet, and a stopper adapted to beengaged with the said hook and jointed to the said spindle in such amanner that the sense of its yieldability coincides with the directionof motion of the hook when the spindle is rotated upon the releasing ofthe said iron piece by the electromagnet.

5. Shock proof starter, comprising a controlling arm, an electromagnet,a hook fixed to the said controlling arm, a spindle adjacent to the saidelectromagnet, an iron piece mounted on the said spindle andco-operating with the said electromagnet, a recoil spring providedaround the said spindle, arauxiliary spindle adjacent to the said firstmentioned main spindle, a coiled spring provided around the auxiliaryspindle strong enough to normally hold the said iron piece on to thepoles of the electromagnet against the action of the saidrecoil spring,and a stopper adapted to be engaged with the said hook and jointed tothe said spindle in such a manner that the sense of its yieldabilitycoincides with the direction of motion of the hook when the spindle isrotated upon the releasing of the said iron piece by the electromagnet.

6. Shock proof starter, comprising a controlling arm, an electromagnet,a hook fixed to the said controllingarm, a spindle adjacent to the saidelectromagnet, an iron piece mounted on the said spindle and cooperatingwith the said electromagnet, a recoil spring provided around the saidspindle, an auxiliary spindle adjacent to the said first mentioned mainspindle, a coiled spring provided around the auxiliary spindle strongenough to normally hold the said iron piece on to the poles of theelectromagnet against the action of the said recoil spring, a stopperadapted to be engaged with the said hook and

